US942843A - Gearing. - Google Patents

Description

J. G. POTTER & J. JOHNSTON.

GEARING. APPLICATION FILED JAN. 7, 1901.

Patented Dec. 7, 1909.

4 SHEETS-SHEET 1 wJ TNIEEEE TI'UHNEYE.

J. C. POTTER & J. JOHNSTON.

GEABING. APPLIOATIOH FILED JAN. 7, 1901.

942,843. Patented Dec. 7,1909.

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J. c. POTTER & J. JOHNSTON. GEARING.

APPLIOATION FILED JAN. '7, 1901.

942,843. Patented Dec. 7, 1909. 4 SHEETS-SHEET a.

IN VENTURE.

UHNEYE'.

WITNZEEEE.

J. G. POTTER & J. JOHNSTON.

GEARING.

nrmunmn rum: JAE. v, 1901.

942,843. Patented Dec.7, 1909.

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6/ 7- 5W WM llNlTllD STATES PATENT OFFICE.

JAMES C. POTTER AND JOHN JOHNSTON, OF PAWTUCKET, RHODE ISLAND, ASSIGNORS TO POTTER AND JOHNSTON MACHINE COMPANY, OF PAWTUCKET, RHODE ISLAND,

A CORPORATION OF RHODE ISLAND.

GEARING.

To all whom it may concern:

Be it known that we, JAMES C. POTTER and J oiiN JonNs'roN,a citizen of the United States and a subject of Great Britain, re-

spectively, residing at Pawtucket, in the county of Providence and State of Rhode Island, have invented a new and useful Improvement in Gearing, of which the follow ing is a specification.

This invention has for reference to mechanism for controlling the operation of the turret supporting slide of a turret lathe; and it consists in the peculiar and novel construction and the combination of the parts whereby the operation of the tool slide may be controlled by the operator and is automatically adjusted to the required feed of the tools and stopped, as will be more fully setforth hereinafter and more particularly pointed out in the claims.

Figure 1 is a transverse vertical sectional view of part of the lathe frame, showing the controlling handle and the mechanism for automatically varying the speed of the reciprocating tool slide supporting the turret. Fig. 2 is a detail showing the connection of the hand-lever socket with the sleeve on which it is supported. Fig. 3 is a horizontal view, partly in section, of the automatic speed controlling mechanism. Fig. 4 is a side view of the shipper disk supporting the dogs controlling the operation of the speedchanging mechanism. Fig. 5 is a view from the under side of the lever connecting the locking latch with the shipper of the speedcont-rolling mechanism. Fig. 6 is an end view of the shipper, shown partly in section. Fig. 7 is a face view of the sun and planet gear, showing the ratchet gear and the controlling mechanism. Fig. 8 is a side elevation of a portion of a turret lathe embodying our invention.

In the embodiment of our invention illustrated in the drawings, a turret lathe is shown having a turret, A, for six tools, and mounted on a slide, B, for the reciprocation of which the mechanism to which our presend invention relates is provided.

Journaled in bearings in the frame of the lathe is a shaft, 6, mounted loose on which is a worm wheel, 0 with which meshes a worm e to which motion is imparted from a suitable source to revolve the Worm wheel.

Specification of Letters Patent.

Application filed January 7, 1901.

Patented Dec. 3', 19699.

Serial No. 42,365.

Adjacent the worm wheel, and for cooperating with it, is a differential gear of familiar construction comprising a gear, 6 fixed to the shaft, 6, a gear, 6 loose thereon, and a pinion, 0 carried by the worm wheel, the gear, e", having one less tooth than the gear, 6'. 0n the side of the loose gear, 6 is a ratchet wheel, 6 with which coacts a pawl, 6 to hold the loose gear from turning, and thus through the differential gear to impart rotation (which is a slow one) from the worm gear to the shaft, 0, the pinion cas it is carried around with the worm wheel being revolved on its own axis and transmitting motion to the gear 6 on the shaft 6. Said pawl, by mechanism to be described, is thrown into and out of engagement with the ratchet wheel. For connecting the worm wheel directly to the shaft, 6, so as to drive the latter at the speed of said gear, a simple clutch may be employed, comprising a sliding cup-form clutch sleeve, e, at one end of the shaft, and splined thereon, and coacting with clutch teeth on the hub, e", of the worm wheel.- to a rod, e which is situated in an axial opening in the shaft, 6, and is connected to a collar, e slidably mounted on the shaft, 6, by the movements of which collar the rod, 6 is moved to actuate the clutch sleeve.

Connected to and moving with the collar, 6 is a rod, 6 that has a notch in its side with oppositely inclined surfaces to act on the inclined end of a pin, 6, attached to the pawl, e the action of said rod on the pawl being to free it from and permit its reengagement with the ratchet wheel. The movements of the rod occur simultaneously with those of the clutch sleeve, 6 so that when the latter is moved to clutch the worm wheel to the shaft, 6, the pawl will be disengaged The clutch sleeve, 6 is attached wheel, f, on a shaft, f and on the latter is a disk, f to which are adjustably attached a series of dogs, 7, the number agreeing with the number of the tools carried by the turret. In the path of the ends of the do s projecting beyond the disk is a pin, f, a justably attached to one end of a lever, i pivoted to a convenient stationary part of the machine. The other end of said lever is in position to en age a stud or pin, P, that projects from a s eeve, e slidably'mounted on a sliding rod which is connected with the collar, 6 and is moved in opposition to the lever, f", by a coiled spring mounted on said rod. Each of the dogs, F, in turn acts on the lever, f and thus causes the movement of the clutch sleeve, e, and the pawl, 0 required to unclutch the worm wheel, E, from the shaft and gear it thereto through the difierential gear. When the lever, f, has been thus actuated by a dog, f, it is locked in the position to which it is moved by a latch, f one end of which engages the lever for this purpose. The other end of the latch is in the path of a series of ins or studs, f, adjustably secured to the disk, f each of which, after a particular one of the dogs, f, has operated the lever, f frees the latter when the shaft, 6, has been run for the predetermined interval at the speed at which it is set to run by the action of the lever, f, such speed being the slow one.

It will be seen that by the successive action of the dogs, and the pins, f, the speed of the shaft, 6, and consequently that of the turret slide, will automatically change from slow to fast, and vice versa, such changes occurring as many times as there are tools in the turret, the turret slide for each tool thus moving slowly while the tool is working and rapidly when it is retracted from the work.

For automatically stopping the machine after all the tools have performed their work, to give opportunity for the removal of the finished work, and the putting in position of a new piece of work, a dog, f, is attached to the disk with an end pro ecting therefrom to engage the lever, f", to move it farther than it 13 moved by the dogs, f so that the movement thereby imparted to the rod, e will carry its inclined surface past that of the pin, a, and thereby lift the pawl 6 from engagement with the diiferentia' gear ratchet wheel, 6 and, as such movement is accompanied by a movementof the clutch sleeve rod, 6 in the direction to disengage the clutch sleeve, 0 from the worm wheel hub, e", the disengagement of the clutch will be continued, and the result is that the shaft, e, is wholly disconnected from the power which is transmitted to the worm wheel, 0 The stoppingdog, f, is situated to act on the lever, f immediately following the action of one of the do s, j, which produces the disengagement o the clutch sleeve, 6 and the worm wheel hub, e, and the engagement of the pawl, 6 with the differential gear ratchet wheel, 0

In order to secure an automatic change or variation in the speed of the tool slide, so that for different tools or the work to be done an appropriate speed of feed of the tool during the performance of its work may be obtained, an automatic speed-changing mechanism is provided that includes a drum If secured to and rotating with the shaft P, which carries a series of cam plates that in succession engage and vibrate a lever 1" similar to the lever f of our Patent No..

7 22,47 7, Oct. 18, 1904, which by its vibration shifts the belt connecting a pair of cone pulleys, so as to vary the speed of the driven cone pulley, which driven cone pulley is geared to the shaft which carries the worm 0 said shaft corresponding to the shaft b" of said Patent No. 7 7 2,47 7 in which patent is shown in. detail the cone and belt gearing referred to.

The starting of the machine after it has been automatically stopped is effected byv hand-operated mechanism, and the machine is at all times under the control of such mechanism for either changing the speed of the shaft, 6, or stopping or starting it.

The hand-operated mechanism comprises a longitudinally movable rod, 6 The rod, e passes through a tube, 6 mounted in the machine frame, and on the outside of the latter is a handle, 6 which projects from a collar, e, to which the rod, e, is fastened, and which is slidingly and rotatably mounted on the end of the tube, 6 The collar, 0", has an inwardly projecting pin that engages a spiral groove in the tube, 6 (see Fig. 2), so that by rotating the collar by means of its handle, the collar, and so the rod, 6 connected therewith will move longitudinally.

The collar and rod are maintained in a normal, central position, ready for movement in either direction, by two opposing spiral springs that, respectively, bear at their opposite ends on the ends of the tube, 6 and at their near ends on collars that are loose on the rod, and bear opposingly on a pin attached to the rod. On the rod, 0 are two collars, e and 6 the former being situated to act on and move the collar sleeve, 6, in. the same direction in which it is i moved by the action of the lever, f and the other being situated to act on and move a lever, 0 for couplin the worm wheel, 0 to the shaft, 0, to drive the latter at high speed. The lever, 6 engages one side of a collar slidably mounted on the hub of the differential gear ratchet wheel, 6 the other side of which collar engages pins, 6, slidably mounted in holes in the ear member, (2*, and engaging a. ring or frame, 6 within such gear member that carries a stud or studs, 6 that pass through holes in the gear member, e, that is fast to the shaft, 6, and by their movement from the lever, 6 are moved into locking engagement with holes in the worm gear, 0 and thereby couple the worm gear, 0 and the gear, e, and thus said worm gear and the shaft, e. Springs acting on the ring or frame, 6 disengage the studs from the worm gear, 0

It will be seen that after the revolution of the shaft, 6, has been automatically stopped by the stop dog, f, it can be started again, and at high speed, by operating the handle, a to move the rod, 6 to rock the lever, 6 to couple the gear, 6, and the worm gear, 0 and that at any time it is desired to change from slow to fast speed it can be done at will by operating the handle, 6 Also, by operating the handle to move the rod to cause the collar, 6 to act to move the sleeve, 6 the speed can be changed from fast to slow, by unclutching the clutch sleeve, 6 and the worm wheel, 0 and engaging the pawl and ratchet of the differential gear; and by continuing the movement far enough to disengage said pawl and ratchet, the machine can be stopped.

Power from the shaft 6 to reciprocate the tool-carrying slide B is taken by a gear wheel 7) (see Fig. 3) which is in mesh with the pinion c on the shaft 6. As the mechanism for imparting motion to the slide B forms no part of the present invention it is not shown in the drawings nor described herein. Such mechanism is shown in Patent No. 735,583, August 4, 1908, to which patent reference may be made for a full understanding thereof.

Having thus described our invention, what we claim is 1. As an ii'nprovement in gearing for moving the turrets of automatic turret lathes, the combination of the member to be moved, means to move said member at predetermined dilferent speeds at various times but in the same direction, and automatic means to select the speeds in succession at which the member is to be moved.

2. As an improvement in gearing for moving the turrets of automatic turret lathes, the combination of the member to be moved,

means to move said member at predetermlned dlfl'erent speeds at various tunes but in the same direction, and automatic means means for varying the speed of said 111cm- 7 her.

4. In a lathe, the combination of a shaft from which power is to be transmitted, mechanisms for moving such shaft at different speeds, including gearing having members moving at different rates of speed, automatic means for rendering said members effective to rotate the shaft and rendering said members inactive to rotate the shaft, a handle operable at will, and connections between said handle and said mechanism, whereby the said members thereof may be connected to the shaft at difierent times, and disconnected therefrom by the manipulation of said handle.

5. In a lathe, the combination of a shaft, several gears for rotating said shaft at different speeds, a lever, a sliding collar, C011- nections between said collar and said gears, whereby the movements of said collar control the operative relation of the several gears to the shaft, automatic means for actuating said lever, a handle, and connections between the same and the collar, whereby the collar may be moved at will.

In testimony whereof we have signed our names to this specification in the presence of two subscribing witnesses.

JAMES C. POTTER. JOHN JOHNSTON.

Witnesses:

B. M. SIMMS, J. A. MILLER, Jr.

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